Corner bead



Feb- 25, 1930. n H. M.-GERSMAN 1,748,284

CORNER BEAD Filed June 26, 1924 2 Sheets-Sheet 2 Y Patentedy Feb. 25,1930 UNITED STATES 'PATENT OFFICE l' HARVEY M. vG-ERSIVIAIT, OF BUFFALO,NLFVV YORK, ASSIGNOR TO KALNIAN STEEL COMPANY, yII\`|'AC.j 'OF CHICAGO,ILLINOIS, A CORPORATION 0F DELAWARE .i

CORNER,` BEAD Application filed .Tune 26, y19524:. Serial No. 722,612.

This invention relates to improvements in beads or strips for thereinforcement of the corners of, plaster finished walls and proposes acorner-bead which is constructed of expanded sheet'metal. i p

The principal objects of the invention are to provide a corner beadwhich may be eco,-y nomically produced, having regard both to rthemanner of its production and to the amount ofA metal required, and tosecure certain pronounced advantages in use which will more'fully appearas the description proceeds. f i

Y The improved corner bead is characterized by parallel strandsincorporated in the wings which extend from the apical nose, whichstrands are presented edgewise so as to oppose minimum'v resistance tothe application of the plasterand to aiiord flat surfaces for the bettersupportt of the plaster. The bead is also distinguished by the novelrelation of the strands to the nose and to the planar edge portions orterminal flanges of the wings; thus the' nose adjoins and projects fromthe outer edges ofthe strands whereby the outer edges of the strands ofeach wing lie in a plane which is spaced a substantial distance behind aparallel plane touching the nose side adjacent snch wing; thecommonplane of the axes of the strands of each-wing is parallel to theprojected plane yof the terminal flange'of the wing, and the expansionis continued right up to the apical nose. YBy these furthercharacteristics advantages are obtained as follows: The thickness of theplaster infront of the wings is sufficient at all points toavoidany'liabiiitv of cracking; the terminaledgesmay inall lcases beused for lining up-the bead regardless of any 'differences in angularitybetween the corner to be reinforced and the angle formed by theintersectiony of the planes of the terminal flanges, andthe plaster iskeyed right up to the nose ofthe bead whereby a fullmonolithic cornerstructure reinforced by expanded metal and having a solid metal edge isobtained.

Other advantages of the present corner bead are that it has maximumkeying and clinching edects and sufficient stiffness to involve aself-sustaining property which will serve for all practical purposes.

In the accompanying drawings I have illustrated the invention ina formwhich as rnow considered is preferred and I have also shown varioussteps in its production in order to illustrate the method ofmanufacturing the same. y

n In said drawings:

Figure 1 is a perspective view of the corner bead. Figure 2 is a sideelevation thereof.

Figure 3 is al'horizontal sectional' View showing the corner bead inuse.

yFigures 4 to 11 illustrate the manufacture of the same.

Figure 4 being an edge view of the blank.

Figure 5 a plan view thereof.

Figures, 7 and 8 edge views schematically showing different steps in thecourse of manufacture.

Figures 9 and 10 bottom plan views showing different stages of theoperation indicated by Figure 7, the stages which these views illustratebeing shown by the lines 9 9 and 10-10 of Figure 7.

Figure 11l a cross section of the bead., y 1

Figures 12, 13 and 14 illustrate the manufacture of an alternative form.

Figure 12 being a plan view of the blank.

Figure 13 a bottom plan view showing a completed stage in the course ofmanufacture, and

nose. The wings are of expanded metal construction and includeyparallel, preferably horizontal,strands 3 and planar edge portions orflanges 4. rFlic strands 3 extend be- :it A, is parallel to the tweenthe nose l and the flanges 4 and are presented edgewise, their flatfaces being in horizontal or substantially horizontal planes. rlhe nosel is of tubular form and may have any desired cross sectional outlinebut preferably has a transversely elliptical cross sec-1 of the wings 2is also continued directly up to the flanges 4" to'A which the strandsare joined by portions 6 twisted into'V substantiallyvver-tical planesand disposed vat the outer sides of said flanges. By reference to FigAure 3 it will be noted that the outer edges of the strands of eachr winglie in a plane indicated by the line X which is Vlocated well bej-` hinda parallel plane indicated by the line Y touching the adjacent side ofthe nose 1, that 1- the plane of the flange 4 forms a continua# tion ofthe plane of the inner yedges of the strands to which said flange isjoined, and that the common plane of the axes of the strands of eachwing, as indicated by Ithe line plane of the corresponding iiange 4. n

In the preferred construction, afs shown in Figures 1, 2 and 3,'thestrands of the opposite Wings have their corresponding ends extended inthe saine direction, that is to say, with reference to the drawing, theends adjacent the nose extended downward and the ends adjacent theflanges 4 extended upward; andas thus formed the strands of one wing arestaggered with relation to the strands of the other wing. These featuresof forni and arrangement permit an advantageous nesting of the ends ofthe strands adjacent the. nose, as best shown in Figure 3 ;y thus itwill be seen that the i inner ends of the strands of one wing over-liethe inner ends of the strandsl of the other .wing and that the twistedportions 'connect with or join the rear side of the nose at or veryclose toa line `longitudinal-ly central of such rear side. l

Figure l3 shows the `corner 4beadin usewfith its flanges '4 Vsecured bynails or otli'erw'vise suitably 'to the wall W t'owhich the layer offinishing plaster P has 'been applied; lt will' be noted thatv (due tothe relation ofthe strands tothe noseof the bead) apiaster layer j "ofsubstantial thickness 'at allpoiiits lies 'at the vouter side of eachwing whereby liability of cracking 'riiininiizech that the flanges 4`are available forlining lip tlrefbe'ad regardless viding a fullmonolithic corner reinforced byV expanded metall and having an exposedcontinuous metal edge.

The corner bead having the features above described may be economicallyproduced by the method exemplified schematically in Figures 4 tollinclusive. The b'ank with which the operation is start-edis illustratedin Figures '4 and 5 and consists of a vrectangular strip of suitableextent which is formed with two rows of diagonal slits Sivaniinperforate portionl intermediate vthe rows of slits and iniperforateedge portions 4a at the outer sides of the rows of slits. Inthe finishedproduct the material between the slits 3a provides vthe strands 3, theintermediate iinperforate kportion la provides the nose l and the outerimperforate portions 4a yprov-ide the yfl-angesrl.

Inr Figure 5 the slits 3a of one row are shown as extending oppositelyand in staggered relation to the slits of the other row, thereby toVprovide for the staggered relation of the f strands of one wing to thestrands of the other wing and for theextension of the corresponding endsof the strands of the two wings in the same-direction, as shown inFigures 2 and 3 and as above described.

The first steps in the production ofthe bead are the bending of the edgeportions 4at at right angles to the strand bearing portion and at thesame side of the planeof the blank, assho'wn in Figure' 6 and thebending of the f strand bear-ing portions at right angles to theintermediate imperforate lport-ion 1i1 and at the same side thereof butin a direction such that the portions 4a and laproject at opposite sidesfroni'the strand bearing portions. VAs a I result of these bendingoperations the blank has the cross sectional form illustrated by fulllines in Figure 7, that is vto say it has a channelled cross sectionwith the portions 4a projecting-laterally outward from the strandbearing portions which form the sides of the channel. Y

Y' The blankhaving",` thus been brought into the forni shoivn in Figure7 is next brought-to the form shown in Figure 8f. l This is accomy.ci

plished by bendingand expanding movements f which are simultaneouslyperformed. In the bending movements the Vstrand bearing portions arebrought back into -a common plane while thefportiens @are Vheldthrough-out in tion, the portion 1a being relatively moved in directionYopposite tothe direction yof movement of the portions 4a and thedirections 'oi these movementsbeing *oppositev to the direcftionsinwhichtlieslits 3i extend. Thus, refferringtov Figure 5, .the slits 3a areshown as .extending upward to the `portions la and ydownward to the`portion 1a and in the expanding planar movements of theseportions the'portions l? are moved downward and the d portionla is moved upward asshown by the ,In aug) 1 arrows in Figures 9 andlO. The abovemenkitioneld relative planar movement of the portion-lopposite totheplanar movement kof the portions 4a may consist either of an absofluteopposite movement of tlieportion 1a or it f vthe slits 3 arelgraduallyor progressively ftui'ned into planes at corresponding angles to thelcommon plane with which the operation started and are lalso graduallyor pro- Y pressively `brought into substantially perpen-"dicularrelation tothe portions la and 4 between which they extend, sothat when the ri'noveinents described are completed, as shown'finf'Figure 8, thewebs of material between the' slits 3a occupyparallelplanes at substantial right anglesto their original common planeland have their Vlongitudinal axes atsubstan- 'tial'j right' angles tothe` longitudinal axes of kfthe portionslafand Lla'which in turn lie atopposite sides Iof the webs, that is to say theportioi'ila'fis'co-planar with tlie'commonplane Vof the edges of thewebs at one side of the expanded blank and the portions la are co- L'planai-Withf the vedgesvof the webs attlie opposite side of theexpanded blank. Figures 9 and l() considered 'comparativelyexvvemplifyithe changein the rrelations of the l.' 'Fil Websvbetween'the slits. AFigure 9 assumes a stage'afte'r the movements havecommenced but prior to the completed'stage which is`-sli`own-b'ylFigure10; Figure-9-shows the Webs as d lying in parallelplanes extending obliqu'elyto the parallel ,planes of the portions laand'lla and as extendingalong axes which form'il'ess than right angleswithlthe `'longitudinal axesof theinipeiforate portionsbut approachnearer in degree to right anglesY than 'the angles which obtained whenthe operation was started", Figure 10 showsthe lWebs as lying inparallel planes Vdisposed claiiii:-. f i ,f n .K i.

k1. A: corneribead having an apicalinose at vright angles tothe commonplanes l of the Aimper'foratei portions and 7as extending along yfaxes`at'right angles to the longitudinal: axes vofthe,imperforateportions:yIt .will be' notedy vthat asfthe bending and expanding movementsprogress the strand bearing portions are gradually increased in yWidthas will appear from the several stages indicated by Vbroken lines inFigure Tand also by a comparison of Figures 9 and `10 and that, as

shown. in these later figures, the voids between the' webs progressivelyincrease in area and progressively approach rectangular outlines asdelimited by the webs and the imvperforate portions'.

The final step in the production of the corner bead involves the changeof the foiin of the expanded blank as shown in Figure 8 whereby toprovide the nose 1 and the wings 2 of the completed corner bead as shownby Figure 11 in Whichthe webs between the slits 3 constitute the strands3. The nose 1 is provided by the intermediate portion 1a ywhich isdeformed in any suitable manner, as b rollin@ from its straio'ht crosssectionas shown in Figure 8 to its tubular cross section as shown inFigure 1l. `The conversion vof theexpan'ded blank into the form ,of the.completedcorner beadis effected solely by andfincidentally to theformation of the nose 1,thatis .to say as the: nose is formed theexpanded portions are bent at angles to one another, each expandedportion maintaining the same relation to the adjacent imperforate ledgeportions 4a which it had in the expanded' blank prior to the formationof the nose.

lVhen the nose has been completely formed the expanded portions have theangular relation by which the corner bead is adapted for 4use in themanner described. rFigures 12,13 and 14 relate to a construction inwhich the strands ofthe tivo Wings have their adjacent end 4portionsyo'ppositely directed and the ends adjacent the nose are not nested asin the previous embodiment. Figure 12 shows the blank for the modifiedfoim,this blank differing fromthe blank of 'Figure 5 in'that the slits3" of both rows extend in the samedirections. The procedure is the same`as inv ther preceding embodiment except that in effecting the expansionof the slitted portions the imperforate edge portions, lieredesignated3b, have their planar `movements iniopposite directions and theimperforate intermediate portion, here designated 1b, is heldstationary, that is to say against planar movement. The expanded blank;has the form shown in Figure 13 and fis transformed into. the completedcorner bead as shown in Figure 4latinl the same way as in the previousembodiment, that is to say -by and incidentallyto the formation ofthenose from they intermediate imperforate portion 1b. n i, y c

Having fully ,described my invention, I

and Wings connected to the rear side of said Y a planary termina-1Vportionto which said strands are connected at their ends remote fromVsaid nose, the nose adjoining and projecting from the outer Vedges ofthe strands and the planar terminal portions adjoining r and projectingfrom the inner edges of the --ystrands, the strands of one Wing beingstaggered relatively to the strands of thel other Wing and adjacent thenose the ends of the strands of they tWo Wings being arranged inoverlying relation.

In testimony whereof I aHX my signature. HARVEY M. GERSMAN.

CERTIFICATE or coRREcrIoN.

Patent No. 1,748,284. Granted February 2s, 1930, to

HARVEY M. GERSMAN.

It is hereby certified that the name of the assignee in the abovenumbered patent was erroneously written and printed as "Kalnian SteelCompany, Inc. whereas said name should have been written and printed as"Kalman Steel Company, Inc.", as shown by the records of assignments inthis office; and that the said Letters Patent should be read with thiscorrection therein that the same may conform to the record of the casein the Patent Office.

Signed and sealed this 15th day of April, A. D. 1930.

M. J. Moore, (Seal) l Acting Commissioner of Patents.

